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Thermoelectric Properties of a Diketopyrrolopyrrole Polymer With Radical Pending Units
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DOI：10.1002/aelm.202500685.png)
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Abstract
En 中文
Organic n-type polymers usually suffer from relatively low electrical conductivity which hampers their application as an active layer for thermoelectrics. Molecular dopants such as benzimidazol-2-yl-N, N-dimethylbenzenamine (N-DMBI) are often employed to improve the polymer's electrical conductivity. It was found that 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) radical can be employed to improve N-DMBI doping efficiency of a bicomponent blend via hydrogen transfer. Herein, we report on a novel n-type conjugated polymer with TEMPO radical moieties attached to the side chains, whose conjugated core is formed by two electron-deficient units, i.e. diketopyrrolopyrrole (DPP) and isoindigo (IID). We show that the electrical conductivity of such TEMPO-functionalized polymer increases up to 4 orders of magnitude upon blending with N-DMBI resulting in a power factor of 0.6 µW m−1 K−2. Additionally, a reference polymer without side-chain TEMPO functionalization was synthesized that did not feature a significant conductivity increase. Our work shows that attaching TEMPO radical units to the side chains of an n-type conjugated polymer is a suitable strategy to boost the doping efficiency of N-DMBI. Our findings contribute to the design of novel n-type conjugated polymers that feature high thermoelectric performances upon blending with a molecular dopant.
Keywords:
conjugated polymer
doping
organic semiconductor
radical
thermoelectric
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